<!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta name="Generator" content="EditPlus®">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>倒计时</title>
 </head>

<script type="text/javascript">
<!--
    h= 0
    m= 0
    s= 30

    function cal()
    {
         --s
          if (s < 0)
          {
              --m
              s= 59
           }
          if (m < 0)
          {
              --h
              m= 59
          }
        if(h>=0)    document.aa.t1.value= h+": "+m+": "+s
        else    {
            alert("考试结束，恭喜你撑到了最后！")
            num= 8
            s= "Do you want to anymore? \n    "
            hehe= "0.0 "
            haha= "~.~ "
            for(i=1; i<=num; ++i) {
                str= s
                for(j=1; j<=i; ++j)        str= str+ ( Math.random( )< 0.5 ? hehe: haha )
                alert ( str )
            }
            return
        }
        setTimeout("cal()",200)
    }
//-->
</script>

 <body bgcolor= #33ffff>
        <form name="aa">
            距离考试结束还剩下：
            <input type=text name="t1">
        </form>
        <SCRIPT LANGUAGE="JavaScript">
            <!--
            cal()
            //-->
        </SCRIPT>
 </body>
</html>